技术人员正在测试带电源引线的矩形LED灯带

up video shows a technician manually testing a rectangular LED light strip containing forty eight individual LED chips. Power leads are applied directly to the PCB terminals to diagnose electrical functionality and circuit performance. Only a few LEDs flicker dimly while most remain unlit, revealing faulty segments across the lighting board. This diagnostic process demonstrates common troubleshooting techniques used to identify defects in solid state lighting components.